One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,6)(3,7,8,5)(9,10,13,12)(11,14,16,15)(17,18,24,29)(19,28,32,41)(20,26,35,45)(21,27,23,39)(22,37,31,25)(30,46,47,43)(33,42,36,44)(34,40,38,48)(1,3,4,8)(2,5,6,7)(9,11)(10,14)(12,15)(13,16)(17,19,21,22,24,32,23,31)(18,25,39,41,29,37,27,28)(20,30,36,38,35,47,33,34)(26,40,42,43,45,48,44,46)(2,6)(3,8)(9,12,13,10)(11,15,16,14)(17,20)(18,26)(19,30)(21,36)(22,38)(23,33)(24,35)(25,40)(27,44)(28,46)(29,45)(31,34)(32,47)(37,48)(39,42)(41,43)(2,6)(3,8)(11,16)(14,15)(17,21,24,23)(18,27,29,39)(19,31,32,22)(20,33,35,36)(25,41,37,28)(26,42,45,44)(30,38,47,34)(40,46,48,43)(2,6)(5,7)(17,22,21,32,24,31,23,19)(18,28,39,25,29,41,27,37)(20,34,36,30,35,38,33,47)(26,43,42,48,45,46,44,40)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.